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| Registros recuperados: 312 | |
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| CARVALHO,Thaís Billalba; SOUZA,Ellen Cristina Monteiro de; PINHEIRO-DA-SILVA,Jaquelinne; VILLACORTA-CORREA,Marle Angélica. |
| ABSTRACT Brycon amazonicus is a native Amazonian fish that is important for aquaculture in South America. Larval mortality is high in this species in intensive breeding systems due to aggressiveness among larvae. The present study investigated experimentally the effects of body size heterogeneity on the aggressive behavior and survival of B. amazonicus during the early stages of larval development. Two treatments (larvae groups with homogeneous and heterogeneous body size) were evaluated throughout early larval stages tested at six time points: 12, 24, 36, 48, 60 and 72 hours after hatching (HAH). Two experiments quantified, respectively, aggressive interactions and mortality rates among larvae at each time point. The frequency of aggressive interactions... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aggressiveness; Fish; Larviculture; Mortality. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672018000400304 |
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| Reis,Simone Matias; Lenza,Eddie; Marimon,Beatriz Schwantes; Gomes,Letícia; Forsthofer,Mônica; Morandi,Paulo Sérgio; Marimon Junior,Ben Hur; Feldpausch,Ted R.; Elias,Fernando. |
| ABSTRACTFire can change the species composition, diversity, and structure of savanna vegetation, thus altering growth and mortality rates. Such changes in the woody vegetation of burned savanna forest were evaluated over four years in comparison to unburned savanna forest. All woody plants with a diameter at breast height > 10 cm were measured in 100 permanent plots. Six months later, 38 of these plots were burned. Three and a half years later, all surviving individuals were re-sampled. Species richness, diversity, and the number of individuals did not change in the burned plots, although they had significantly higher (p < 0.05) increases in basal area and mortality rates (5.1% year-1) than the unburned plots (3.0% year-1).Tachigali vulgarishad the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conservation; Land-use change; Mortality; Structural and floristic changes; Wildfire. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000300408 |
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| Luz-Freire,Hévila Prates; Trindade,Diego Pires Ferraz da; Sá-Neto,Raymundo José de; Corrêa,Michele Martins. |
| Studies on the survival of species are essential to understanding their biology and to developing effective conservation and management plans. This study aimed to determine the best model to explain the survival of the species Melocactus conoideus on the basis of time, density, age structure and habitat location, as well as to describe the interactions among those factors. The study was conducted in three M. conoideus habitat patches in the municipality of Vitória da Conquista, in the state of Bahia, Brazil, only one of which was within a "conservation unit" (protected area). In each patch, we selected 120 specimens of M. conoideus, which were marked with identification plates and classified by developmental stage and density. The survival of those... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cactus; Mortality; Population ecology; Spatial aggregation. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000200016 |
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| Lombardi,Julio Antonio; Temponi,Lívia Godinho; Leite,Claudia Aparecida. |
| This is a 30-month study of mortality rates and diameter growth rates of lianas in a semideciduous forest fragment in Belo Horizonte, Minas Gerais State, Brazil. Results are presented for 484 specimens of lianas, of which 103 experienced individual mortality (21.3% of the sampled population). Mortality varied according to class of stem diameter, but did not vary throughout the months of year, or between seasons or years. Mortality rates were higher than those recorded in other studies, perhaps due to the age of this secondary forest. Stem diameter growth rates were measured for 385 lianas, the survivors after 30 months plus four plants that died just before the final census, and averaged 1.2mm/year, ranging from 0mm/year (Chioccoca alba) to 4.8mm/year... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lianas; Mortality; Diameter growth; Minas Gerais State; Secondary forest. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33061999000200005 |
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| Pinto,José Roberto Rodrigues; Mews,Henrique Augusto; Jancoski,Halina Soares; Marimon,Beatriz Schwantes; Bomfim,Bárbara de Oliveira. |
| Campos de murundus (grasslands dotted with knolls that are covered with savanna-like woody vegetation) are a common landscape in central Brazil. In this study, we assessed for the first time the dynamics of the vegetation in a floodplain campo de murundus, describing changes in composition and structure of the woody vegetation. In 2005, we established 16 permanent 25 × 25 m plots, where we identified and mapped individuals with a trunk diameter at the base ≥ 2.86 cm, as well as measuring the height of those individuals. In 2008 (after two fire events), we resampled the plots. In 2005, we had registered 4.54 m² ha-1 of basal area, 430 individuals, 42 species, 36 genera and 24 families. In 2008, we found an increase in basal area (to 4.65 m² ha-1) and a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Earth mounds; Fire; Mortality; Recruitment; Savanna. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000400005 |
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| Silva, Waldirene Rossi da; UEM; Scapinello, Cláudio; UEM; Moraes, Gentil Vanini de; UEM; Martins, Elias Nunes; UEM; Faria, Haroldo Garcia de; UEM; Ferreira, Walter Motta; UFMG. |
| Foram utilizadas 240 ninhadas oriundas de 80 matrizes NZB, nulíparas, durante três ciclos reprodutivos, submetidas a um ritmo de reprodução de 42 dias, distribuídas em um delineamento inteiramente casualizado, em esquema fatorial 2 x 2 x 3 (2.600 e 2.800 kcal ED kg-1 de ração versus desmama aos 28 e 35 dias versus três ciclos reprodutivos). O nível de ED nas rações não afetou o peso das matrizes na desmama de seus láparos e as taxas de fertilidade, independente do ciclo reprodutivo. A melhor condição corporal nos três ciclos das matrizes que desmamaram seus láparos aos 28 dias, permitiu taxas de fertilidade mais altas durante todo o período experimental. À exceção do tamanho da ninhada ao nascer, que foi menor no primeiro parto, o tamanho da ninhada aos 21... |
| Tipo: Pesquisa de campo |
Palavras-chave: Produção Animal; Nutrição de não-ruminantes desempenho de láparos; Tamanho da ninhada; Condição corporal da matriz; Taxa de mortalidade; Fertilidade 5.04.05.00-4 litter performance; Litter size; Corporal condition of does; Mortality; Fertility. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/6619 |
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| Sousa, Fabricio Barros de; Universidade Federal Rural da Amazônia; Soares, Maria Gercilia Mota; Instituto Nacional de Pesquisas da Amazônia; Prestes, Luiza; Universidade do Estado do Amapá. |
| Fish is the main source of protein in the Amazon and fishing is one of the most important sources of income for the Amazonian population. Serrasalmus spilopleura is a species that have been increasingly consumed by riverside communities, although it is only occasionally commercialized at regional markets. Therefore, this work sought to generate information about the population biology of S. spilopleura captured in floodplain lakes, Jaitêua and São Lourenço, in Manacapuru, Amazonas State. The population parameters were estimated by analyzing the distribution of the length frequency with the help of the ELEFAN I routine of the FISAT II program. The weight/length relationship was estimated by linear regression, longevity by Taylor’s method, rate of natural... |
| Tipo: Population dynamics of fish |
Palavras-chave: 2.05.00.00-9 growth; Mortality; Freshwater fish; Weight/length relationship; ELEFAN Ecologia. |
| Ano: 2013 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/15749 |
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| Brighenti, Deodoro Magno; Universidade Federal de Lavras; Brighenti, Carla Regina Guimarães; Universidade Federal São João Del-Rei. |
| The flower of balsa wood holds about 10 to 15 mL of nectar, which helps attracting pollinating agents, since the genus Ochroma is incapable of self-fertilization. However, a high mortality of bees is observed in these flowers. The present study investigated the frequency and constancy of mortality of the individuals of the family Apidae that fed on nectar from the balsa wood. Data was gathered from June to August 2008, in Lavras – Minas Gerais State, Brazil. In addition, the survival of the Africanized bees that fed on the nectar of this flower was compared to those that fed on 50% aqueous solution of honey. Forty flowers were analyzed, and 949 individuals of the orders Hymenoptera (98.1%), Hemiptera (0.95%), Coleoptera (0.74%) and Diptera (0.21%) were... |
| Tipo: Estudos de mortalidade |
Palavras-chave: 2.05.03.00-8 Apis; Constancy; Mortality; Partamona; O. pyramidale Ecologia Aplicada Apis; Constancy; Mortality; Partamona; O. pyramidale. |
| Ano: 2010 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/7103 |
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| Viott,R.C.; Menezes,T.A.; Mellagi,A.P.G.; Bernardi,M.L.; Wentz,I.; Bortolozzo,F.P.. |
| ABSTRACT The study aimed to investigate the effect of oral protein-energy supplement (OPES) and/or extra colostrum within the first few hours of life on the survival and growth performance of low birth-weight piglets during the suckling period. Based upon nutritional strategy, low-birth-weight piglets (804−1309g) were randomly allocated into four groups: C0S0 (control group, n= 300) - no supplementation; C1S0 (n= 299) - supplementation with 50mL of a colostrum pool through an orogastric tube; C0S1 (n= 298) - oral supplementation with 8mL oral OPES; C1S1 (n= 297) - supplementation with both 50mL of colostrum and 8mL of OPES. The piglets’ body weight was monitored at birth, 24h after birth, on day 7, day 14 and day 20 post-partum. Both colostrum and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Supplementation; Colostrum; Weight gain; Mortality. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352018000401293 |
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| Rocha-e-Silva,R.C.; Cardoso,W.M.; Horn,R.V.; Cavalcanti,C.M.; Beleza,A.J.F.; Almeida,C.P.; Bezerra,W.G.A.; Carmo,C.C.; Nogueira,C.H.G.; Lima,B.P.; Marques,A.R.; Teixeira,R.S.C.. |
| ABSTRACT Salmonella Gallinarum is capable of causing high mortality in birds of the order Galliformes. This study aimed to relate the presence of clinical signs with the recovery of Salmonella Gallinarum from organs and c loacal swabs of Japanese quails (Coturnix coturnix) experimentally infected. A total of 70 female quails were housed in a pair per cage and divided in two groups (IG: quails inoculated with 1.5x106 CFU of Salmonella Gallinarum Nalr/mL and CG: control group). After the inoculation, birds were evaluated three times a day to verify the presence of clinical signs. Birds that presented ruffled feathers, eyes closed and remained quiet in the cage were removed for euthanasia, as well as the same number of birds from the inoculated groups that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Immune response; Isolated; Mortality; Clinical signs. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352018000401187 |
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| Lehmann,M.; Schleder,D.D.; Guertler,C.; Perazzolo,L.M.; Vinatea,L.. |
| The present study aimed to evaluate the mortality, reactive oxygen species production (ROS) and total hemocyte counts (THC) of the marine shrimp Litopenaeus vannamei infected with the white spot syndrome virus (WSSV) at three levels of oxygen saturation. For this, 360 shrimp (20±2g) were distributed in 24 tanks (60L), divided in two groups (infected and non-infected), which were subjected to 30, 60 and 100% of dissolved oxygen saturation (in quadruplicate). During 96 hours after infection, daily hemolymph samples were collected for hemato-immunological parameter evaluation (THC and ROS) and dead animals were removed and computed to assess cumulative mortality rates. In the infected group, animals subjected to 100% saturation showed higher ROS production... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Litopenaeus vannamei; WSSV; Dissolved oxygen saturation; Immune response; Mortality. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352016000200397 |
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| Losinger,W.C.; Bush,E.J.; Smith,M.A.; Corso,B.A.. |
| For 53 grower/finisher-only swine operations that participated in the United States National Animal Health Monitoring System 1995 National Swine Study, mortality among finisher pigs ranged from 0 to 12.0% over a 6-month period. Twenty-six (49.1%) had <2% mortality, and 27 (50.9%) had >2% mortality. Nine (17.0%) operations experienced >4% mortality. Fisher's exact test revealed that operations with all-in all-out management were significantly more likely to have <2% mortality than operations with continuous management, and that operations where all finisher pigs came from farrowing units belonging to the operation (either on-site or off-site) were significantly more likely to have <2% mortality than operations where >1 grower/finisher pig... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pig; Swine grower/finisher; Mortality; Animal health. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09351999000200003 |
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| RENAUD,SERGE; LANZMANN-PETITHORY,DOMINIQUE; GUEGUEN,RENÉ; CONARD,PASCALE. |
| A large number of prospective studies have observed an inverse relationship between a moderate intake of alcohol and coronary heart disease morbidity and mortality. Concerning death from all-causes, results are not unanimous. Alcohol intake was associated with a protection of all-cause mortality in England and USA physicians and the large study of the American Cancer Society. None of these studies separated the effects of different alcoholic beverages. In our prospective studies in France on 35 000 middle-aged men, we observed that only wine at moderate intake, was associated with a protective effect on all-cause mortality. The reason was that in addition to the known effect on cardiovascular diseases, a very moderate intake of wine, protected also from... |
| Tipo: Journal article |
Palavras-chave: Alcohol; Mortality; Wine. |
| Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000200002 |
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| WALLACE,ANNE; ORTÍZ,SILVIA; SÁNCHEZ,GITTITH; VILLAGRA,REBECA; MUGA,MABEL; SOLARI,ALDO. |
| The biological characterization of bloodstream forms of eleven Trypanosoma cruzi cloned stocks, corresponding to two genetically similar clonets (<A HREF="#19">19</A> and <A HREF="#20">20</A>) and one distant clonet (39), according to multilocus enzyme electrophoresis analysis, showed dissimilar parasitemia in an experimental isogenic mouse model. While clonet 39 stocks gave low parasitemias, clonets 19 or 20 stocks gave high parasitemias, independently of the inocula (10² and 10(4) bloodstream forms) used. High parasitemia did not always associate with greater mortality. Statistical studies on mortality using a low inocula showed significantly higher mortality with clonet 39 stocks when compared to clonets 19 or 20 stocks. Finally,... |
| Tipo: Journal article |
Palavras-chave: Trypanosoma cruzi; Clonets; Parasitemia; Mortality; Bloodstream forms; Multilocus enzyme electrophoresis. |
| Ano: 2001 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602001000200011 |
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| Vasconcelos,Lilian Paula; Súarez,Yzel Rondon; Lima-Junior,Sidnei Eduardo. |
| In order to describe some aspects of the population ecology of Bryconamericus stramineus in the Guiraí River basin, upper Paraná River basin, samples were taken bimonthly from October 2006 to August 2007 at seven sites in the basin. A total of 960 individuals, including 532 females, 316 males, and 112 of undetermined sex, were collected. A significant variation in the sex ratio was observed (Χ2 = 32.82; p < 0.001). Females were larger (59.7 mm) than males (58.9 mm); however, males showed a larger angular growth coefficient (b) than females. It was estimated that 50% of females were sexually mature at 36.4 mm. The highest rate of ovary development was observed in October, while in June 2007 no mature females were found. Mean fecundity was estimated at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Length-weight relationship; Mortality; Reproductive strategy; Sex ratio. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032011000200006 |
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| Resende,Júlio Carlos França; Klink,Carlos Augusto; Schiavini,Ivan. |
| Population dynamics and structure of young individuals of the tree Copaifera langsdorffii Desf. (Caesalpiniaceae) were studied in the gallery forest of the Panga Ecological Station, Uberlândia, MG, Brazil. Three distinct habitats were recognized in this forest, Dike, Middle and Edge zone. Four annual surveys of plant height, diameter at plant base and density were made between 1993 and 1996. The species showed an aggregated distribution in all three habitats. Population structure in all four surveys presented the typical reversed "J" form, characteristic of populations in local regeneration. For the whole population, mortality rates during the four years were constant and low (average of 4.8 % per year), while recruitment declined during the same period... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gallery forest; Seedling; Recruitment; Mortality; Growth; Saplings. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000300012 |
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| Registros recuperados: 312 | |
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